EP3090185A1 - Centrifugal pump comprising a cutting device - Google Patents

Centrifugal pump comprising a cutting device

Info

Publication number
EP3090185A1
EP3090185A1 EP15713648.2A EP15713648A EP3090185A1 EP 3090185 A1 EP3090185 A1 EP 3090185A1 EP 15713648 A EP15713648 A EP 15713648A EP 3090185 A1 EP3090185 A1 EP 3090185A1
Authority
EP
European Patent Office
Prior art keywords
impeller
cutting
centrifugal pump
pump according
cutting insert
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP15713648.2A
Other languages
German (de)
French (fr)
Other versions
EP3090185B1 (en
Inventor
Alfred J. Otto
Wolfgang Geier
Wolfgang Strössner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wilo SE
Original Assignee
Wilo SE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wilo SE filed Critical Wilo SE
Priority to PL15713648T priority Critical patent/PL3090185T3/en
Publication of EP3090185A1 publication Critical patent/EP3090185A1/en
Application granted granted Critical
Publication of EP3090185B1 publication Critical patent/EP3090185B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
    • F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous
    • F04D7/045—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous with means for comminuting, mixing stirring or otherwise treating

Definitions

  • the invention relates to a centrifugal pump in particular sewage or
  • the pump suction opening facing the end face forms an opening and the suction opening facing away impeller end face is covered by a support disk on which the curved blades are fastened in particular formed.
  • centrifugal pumps are known in which a cutting device is arranged in front of the impeller whose rotatable cutting part is seated on the pump shaft. Furthermore, from DE 26 34 683 known to form the leading edges of the blades of an impeller as cutting edges. In these known sewage pumps, it has been shown that when coarse
  • the object of the invention is to improve a centrifugal pump of the type mentioned so that it is largely blockage-free at high flow rate.
  • a cutting insert projects coaxially to the impeller axis having at least one cutting edge, which forms a cutting device with at least one counter cutting edge of the impeller.
  • Impeller with a cylindrical portion that forms the suction port of the pump is also proposed that the impeller with a cylindrical annular region outside surrounds the cylindrical region of the cutting insert as a bearing.
  • a safe storage of the cutting unit is achieved when the impeller forms on the pump suction side facing away from a pivot bearing for the cutting unit.
  • the cutting insert has two to four, in particular three arranged in the running wheel curved cutting blades, each with a cutting edge.
  • the impeller one to three in particular have two counter cutting edges. It is also advantageous if the counter cutting edges of the impeller of the inner end edges of the
  • Impeller blades are formed.
  • the cutting action and clogging freedom is further improved by the fact that the blades of the impeller are curved towards the impeller interior such that the generatrices of the impeller inner surface are formed by a plurality of straight lines which are parallel to the axis of rotation of the impeller. This should be the inner
  • Impeller axis lie.
  • impeller and cutting insert An optimal storage, management and operation of impeller and cutting insert is given if the impeller has part-cylindrical wall parts within the blades, within which the cutting insert is part cylindrical outer surfaces, wherein the inner radius of the impeller wall portion is equal to or only slightly larger than the outer radius the blade outer surfaces.
  • Figure 1 is an axial section through the centrifugal pump
  • Figure 2 is a perspective view of the pump when removed
  • Figure 3 is a plan view of the parts, as shown in Figure 2
  • the centrifugal pump has a pump housing 1, which is fastened with its flange 2 to the flange of an electric motor, not shown, and a Pump chamber forms, in which an impeller 3 is mounted with its two blades 4.
  • the impeller has an impeller body with two part-cylindrical (resp.
  • the part-cylindrical wall parts 5 and the blades 4 extending outward from the wall parts 5 are fastened on the side facing the motor to a circular support disk 8 coaxial with the pump axis, in particular on which a hub 9 protrudes on the outside, to which the motor shaft is fastened.
  • the wall parts 5 pass over into a cylindrical ring 10 which is coaxial with the pump axis and which has the same shape
  • the cylindrical interior 12 of the ring 10 has the same diameter D as the inner spacing of the wall parts 5 from each other.
  • the impeller 3 is coaxial with the fixed, non-rotating cutting insert 13, which has a cylindrical, partially perforated coaxial outer casing 14, which forms a cylindrical annular region 15 at its end remote from the motor.
  • the annular portion 15 is located with its cylindrical outer shell in the ring 10 of the impeller, wherein the outer diameter of the annular portion only
  • the impeller 3 is rotatably mounted with its ring 10 on the annular portion 15 of the cutting insert.
  • the interior of the cylindrical ring portion 15 forms the suction port 11 of the pump.
  • a cone-shaped extension 17 at the front end of the annular region 15 facilitates the inflow and forms the attachment of the
  • Cylinder surface are located in which also the outer surface of the annular portion 15 is located.
  • the ends of the cutting blades 18 are fixed to a coaxial to the pump axis disc or inner plate 19 which is adjacent to the inside of the support plate 8.
  • the inner plate 19 adjoining the inner side of the support disk 8 forms a second bearing point for the cutting unit.
  • Each fixed cutting blade 18 of the cutting insert forms a cutting edge 21 on a curved edge facing the impeller blades 4 which cooperate with counter cutting edges 22 located at the inner ends of the blades 4.
  • the counter cutting edges 22 of the impeller drive over the cutting edges 21 of the cutting blades, so that sheared between these cutting edges solid parts of the dirty water sheared and crushed.
  • the outer surfaces of the annular portion 15 and the cutting blades 18 are in a coaxial to the pump axis cylinder jacket whose radius is equal to, or minimally smaller than the radius of the cylindrical inner surfaces of the ring 10 and the wall parts 5 of the impeller 3, so that the impeller of the cylindrical

Abstract

The invention relates to a centrifugal pump, in particular a waste-water motor pump or dirty-water motor pump, comprising an impeller (3), the side of which facing the pump suction port forms an opening and the side of which facing away from the suction port is covered by a support plate (8) to which the curved blades (14) are fastened, in particular molded. A cutting insert (13) projects into the interior of the impeller, coaxially with the impeller axis, said insert having at least one cutting edge (21) which forms a cutting device together with a mating cutting edge (22) of the impeller.

Description

Kreiselpumpe mit Schneidvorrichtung  Centrifugal pump with cutting device
Die Erfindung betrifft eine Kreiselpumpe insbesondere Abwasser- oder The invention relates to a centrifugal pump in particular sewage or
Schmutzwasser-Motorpumpe mit einem Laufrad, dessen der Pumpensaugöffnung zugewandte Stirnseite eine Öffnung bildet und die der Saugöffnung abgewandte Laufrad-Stirnseite durch eine Tragscheibe bedeckt ist, an der die gekrümmten Schaufeln befestigt insbesondere angeformt sind. Dirty water engine pump with an impeller, the pump suction opening facing the end face forms an opening and the suction opening facing away impeller end face is covered by a support disk on which the curved blades are fastened in particular formed.
Aus der DE 33 40 858 und DE 10 2008 057 233 sind Kreiselpumpen bekannt, bei denen vor dem Laufrad eine Schneideinrichtung angeordnet ist, deren drehbares Schneidteil auf der Pumpenwelle sitzt. Ferner ist aus der DE 26 34 683 bekannt, die Vorderkanten der Schaufeln eines Laufrades als Schneidkanten auszubilden. Bei diesen bekannten Abwasserpumpen hat es sich gezeigt, dass bei groben From DE 33 40 858 and DE 10 2008 057 233 centrifugal pumps are known in which a cutting device is arranged in front of the impeller whose rotatable cutting part is seated on the pump shaft. Furthermore, from DE 26 34 683 known to form the leading edges of the blades of an impeller as cutting edges. In these known sewage pumps, it has been shown that when coarse
Rohabfällen und insbesondere bei langfaserigen Textilrückständen es doch noch zu Verstopfungen kommt. Raw waste and especially in long-fiber textile residues it still comes to blockages.
Aufgabe der Erfindung ist es, eine Kreiselpumpe der eingangs genannten Art so zu verbessern, dass sie bei hoher Durchflussrate weitgehend verstopfungsfrei ist. The object of the invention is to improve a centrifugal pump of the type mentioned so that it is largely blockage-free at high flow rate.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass in den Innenraum des Laufrades ein Schneideinsatz koaxial zur Laufradachse hineinragt, der mindestens eine Schneidkante aufweist, die mit mindestens einer Gegenschneidkante des Laufrades eine Schneidvorrichtung bildet. This object is achieved in that in the interior of the impeller, a cutting insert projects coaxially to the impeller axis having at least one cutting edge, which forms a cutting device with at least one counter cutting edge of the impeller.
SESTÄTIQyWGSKOf Durch das Anordnen des Schneideinsatzes innerhalb des Laufrades gelingt es, einen verhältnismäßig großen Innenraum mit einer entsprechend großen Saugöffnung zu schaffen, so dass eine hohe Durchflussrate erzielt wird und durch die großen SESTATI Q yWGSKOf By arranging the cutting insert within the impeller, it is possible to create a relatively large interior with a correspondingly large suction opening, so that a high flow rate is achieved and by the large
Schneidblätter des Schneideinsatzes mit entsprechend großen Schneidkanten des Laufrades optimale Schneidleistungen erzielt werden. Zu dem weist die Cutting blades of the cutting insert with correspondingly large cutting edges of the impeller optimum cutting performance can be achieved. To which the points
erfindungsgemäße Pumpe folgende Vorteile auf: Pump according to the invention the following advantages:
- eine hohe Schneidkraft insbesondere durch die günstigen Winkel der a high cutting force especially due to the favorable angle of
Schneidkanten und deren scherenden Wirkung,  Cutting edges and their shearing effect,
- eine optimale Lagerung des Laufrades und des Schneideinsatzes,  optimum storage of the impeller and the cutting insert,
- eine elastische Bauweise und Lagerung der Teile der Schneid-, bzw.  - An elastic construction and storage of the parts of the cutting, or
Schervorrichtung,  Shearing device,
- eine Justierung ist nicht erforderlich,  - an adjustment is not required
- eine lange Lebensdauer und eine Reduzierung der Wartungskosten  - a long life and a reduction of maintenance costs
- eine einfache Konstruktion und Herstellung insbesondere Montage.  - a simple design and manufacture in particular assembly.
Eine optimale Strömungsführung und ein sehr großer Saugeingang wird dann erreicht, wenn der Schneideinsatz die dem Motor abgewandte Öffnung des An optimal flow guidance and a very large suction inlet is achieved when the cutting insert facing away from the engine opening of the
Laufrades mit einem zylindrischen Bereich ausfüllt, der die Saugöffnung der Pumpe bildet. Hierzu wird auch vorgeschlagen, dass das Laufrad mit einem zylindrischen Ringbereich außen den zylindrischen Bereich des Schneideinsatzes als Lager umgibt. Impeller with a cylindrical portion that forms the suction port of the pump. For this purpose, it is also proposed that the impeller with a cylindrical annular region outside surrounds the cylindrical region of the cutting insert as a bearing.
Ein optimaler Halt des Schneideinsatzes in der Pumpe ist dann gegeben, wenn der Schneideinsatz aus der Öffnung des Laufrades herausragt und mit seinem herausragenden Bereich an dem Pumpengehäuse drehfest befestigt ist. An optimal hold of the cutting insert in the pump is given when the cutting insert protrudes from the opening of the impeller and is fixed non-rotatably with its protruding portion on the pump housing.
Eine sichere Lagerung des Schneidwerkes wird erreicht, wenn das Laufrad auf der der Pumpensaugöffnung abgewandten Seite ein Drehlager für das Schneidwerk bildet. A safe storage of the cutting unit is achieved when the impeller forms on the pump suction side facing away from a pivot bearing for the cutting unit.
Sehr gute Schneidergebnisse werden erzielt, wenn der Schneideinsatz zwei bis vier insbesondere drei im Laufradinneren angeordnete gebogene Schneidblätter mit jeweils einer Schneidkante aufweist. Hierbei kann das Laufrad ein bis drei insbesondere zwei Gegenschneidkanten aufweisen. Auch ist es von Vorteil, wenn die Gegenschneidkanten des Laufrades von den inneren Endkanten der Very good cutting results are achieved when the cutting insert has two to four, in particular three arranged in the running wheel curved cutting blades, each with a cutting edge. Here, the impeller one to three in particular have two counter cutting edges. It is also advantageous if the counter cutting edges of the impeller of the inner end edges of the
Laufradschaufeln gebildet sind. Impeller blades are formed.
Die Schneidwirkung und Verstopfungsfreiheit wird noch dadurch verbessert, dass die Schaufeln des Laufrades zum Laufradinneren hin derart gekrümmt sind, dass die Erzeugenden der Laufradinnenfläche von einer Vielzahl von Geraden gebildet sind, die parallel zur Drehachse des Laufrades liegen. Hierbei sollte die innere  The cutting action and clogging freedom is further improved by the fact that the blades of the impeller are curved towards the impeller interior such that the generatrices of the impeller inner surface are formed by a plurality of straight lines which are parallel to the axis of rotation of the impeller. This should be the inner
Schneidkante jeder Schaufel als inneres Ende der Schaufel parallel zur Cutting edge of each blade as the inner end of the blade parallel to
Laufraddrehachse liegen. Impeller axis lie.
Die Strömungsführung des Abwasser- oder Schmutzwassers wird dadurch The flow of sewage or wastewater is characterized
verbessert, dass die Saugöffnung des Schneideinsatzes sich zum Pumpeneinlass hin konusförmig erweitert. improves that the suction opening of the cutting insert widens conically towards the pump inlet.
Eine optimale Lagerung, Führung und Arbeitsweise von Laufrad und Schneideinsatz ist gegeben, wenn im Bereich der Schaufeln das Laufrad teilzylindrische Wandteile aufweist, innerhalb derer der Schneideinsatz mit teilzylindrischen Außenflächen liegt, wobei der Innenradius des Laufrad-Wandteils gleich oder nur gering größer ist als der Außenradius der Schneidblatt-Außenflächen. An optimal storage, management and operation of impeller and cutting insert is given if the impeller has part-cylindrical wall parts within the blades, within which the cutting insert is part cylindrical outer surfaces, wherein the inner radius of the impeller wall portion is equal to or only slightly larger than the outer radius the blade outer surfaces.
Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen dargestellt und wird im Folgenden näher beschrieben. Es zeigen An embodiment of the invention is illustrated in the drawings and will be described in more detail below. Show it
Figur 1 einen axialen Schnitt durch die Kreiselpumpe; Figure 1 is an axial section through the centrifugal pump;
Figur 2 eine perspektivische Ansicht der Pumpe bei abgenommener Figure 2 is a perspective view of the pump when removed
Gehäusehälfte und ohne Tragscheibe und Innenplatte des Laufrades und des Schneideinsatzes;  Housing half and without support disk and inner plate of the impeller and the cutting insert;
Figur 3 eine Draufsicht auf die Teile, wie sie in Figur 2 dargestellt Figure 3 is a plan view of the parts, as shown in Figure 2
sind.  are.
Die Kreiselpumpe weist ein Pumpengehäuse 1 auf, das mit seinem Flansch 2 an dem Flansch eines nicht dargestellten Elektromotors befestigt wird und einen Pumpenraum bildet, in dem ein Laufrad 3 mit seinen zwei Schaufeln 4 gelagert ist. Das Laufrad besitzt einen Laufradkörper mit zwei teilzylindrischen (bzw. The centrifugal pump has a pump housing 1, which is fastened with its flange 2 to the flange of an electric motor, not shown, and a Pump chamber forms, in which an impeller 3 is mounted with its two blades 4. The impeller has an impeller body with two part-cylindrical (resp.
zylindersektorförmigen) Wandteilen 5, die jeweils in eine gewölbte Schaufel 4 übergehen, die sich nach außen erstreckt und jeweils eine Öffnung 6 im Laufrad teilweise überdeckt, durch die das Wasser vom Laufradinneren zum Pumpenauslass 7 strömt, wie Figur 3 zeigt. cylindrical sector-shaped) wall parts 5, which each pass into a curved blade 4, which extends outwardly and partially covers an opening 6 in the impeller through which the water flows from the impeller interior to the pump outlet 7, as Figure 3 shows.
Die teilzylindrischen Wandteile 5 und die von den Wandteilen 5 sich nach außen erstreckenden Schaufeln 4 sind auf der dem Motor zugewandten Seite an einer zur Pumpenachse koaxialen kreisförmigen Tragscheibe 8 befestigt insbesondere angeformt, an der außenseitig eine Nabe 9 vorsteht, an der die Motorwelle befestigt wird. Auf der dem Motor abgewandten Seite gehen die Wandteile 5 in einen zur Pumpenachse koaxialen zylindrischen Ring 10 über, der den gleichen The part-cylindrical wall parts 5 and the blades 4 extending outward from the wall parts 5 are fastened on the side facing the motor to a circular support disk 8 coaxial with the pump axis, in particular on which a hub 9 protrudes on the outside, to which the motor shaft is fastened. On the side facing away from the engine, the wall parts 5 pass over into a cylindrical ring 10 which is coaxial with the pump axis and which has the same shape
Innendurchmesser und Innenradius wie die Wandteile 5 besitzt und einen Inner diameter and inner radius as the wall parts 5 and has a
Schneideinsatz 13 und damit die Pumpensaugöffnung 11 umgibt. Somit weist der zylindrische Innenraum 12 des Rings 10 denselben Durchmesser D auf, wie der Innenabstand der Wandteile 5 voneinander. Cutting insert 13 and thus the pump suction 11 surrounds. Thus, the cylindrical interior 12 of the ring 10 has the same diameter D as the inner spacing of the wall parts 5 from each other.
Im Laufrad 3 liegt koaxial der fest stehende, nicht rotierende Schneideinsatz 13 ein, der einen zylindrischen, teilweise durchbrochenen koaxialen Außenmantel 14 besitzt, der an seinem dem Motor abgewandten Ende einen zylindrischen Ringbereich 15 bildet. Der Ringbereich 15 liegt mit seinem zylindrischen Außenmantel in dem Ring 10 des Laufrades ein, wobei der Außendurchmesser des Ringbereichs nur In the impeller 3 is coaxial with the fixed, non-rotating cutting insert 13, which has a cylindrical, partially perforated coaxial outer casing 14, which forms a cylindrical annular region 15 at its end remote from the motor. The annular portion 15 is located with its cylindrical outer shell in the ring 10 of the impeller, wherein the outer diameter of the annular portion only
geringfügig geringer ist als der Innendurchmesser D des Laufradrings 10, so dass das Laufrad 3 mit seinem Ring 10 auf dem Ringbereich 15 des Schneideinsatzes drehbar gelagert ist. Hierbei bildet das Innere des zylindrischen Ringbereichs 15 die Saugöffnung 11 der Pumpe. Eine konusförmige Erweiterung 17 am vorderen Ende des Ringbereichs 15 erleichtert den Zufluss und bildet die Befestigung des is slightly smaller than the inner diameter D of the impeller ring 10, so that the impeller 3 is rotatably mounted with its ring 10 on the annular portion 15 of the cutting insert. Here, the interior of the cylindrical ring portion 15 forms the suction port 11 of the pump. A cone-shaped extension 17 at the front end of the annular region 15 facilitates the inflow and forms the attachment of the
Schneideinsatzes 13 an dem Pumpengehäuse 1. Cutting insert 13 on the pump housing. 1
An dem Ringbereich 15 sind als Teil des Außenmantels 14 drei gekrümmte schmale fingerförmige Schneidblätter 18 angeformt, die sich vom Ringbereich 15 in Richtung des Motors erstrecken und dessen Außenflächen sich in der gedachten Formed on the annular region 15 as part of the outer jacket 14 are three curved narrow finger-shaped cutting blades 18, which extend from the annular region 15 in the direction of the motor and whose outer surfaces are imaginary
Zylinderfläche befinden, in dem auch die Außenfläche des Ringbereichs 15 liegt. Hierbei sind die Enden der Schneidblätter 18 an einer zur Pumpenachse koaxialen Scheibe bzw. Innenplatte 19 fest, die an der Innenseite der Tragscheibe 8 angrenzt. Die an der Innenseite der Tragscheibe 8 angrenzende Innenplatte 19 bildet eine zweite Lagerstelle für das Schneidwerk. Cylinder surface are located in which also the outer surface of the annular portion 15 is located. Here, the ends of the cutting blades 18 are fixed to a coaxial to the pump axis disc or inner plate 19 which is adjacent to the inside of the support plate 8. The inner plate 19 adjoining the inner side of the support disk 8 forms a second bearing point for the cutting unit.
Jedes feststehende Schneidblatt 18 des Schneideinsatzes bildet an einer den Laufradschaufeln 4 zugewandten gekrümmten Kante eine Schneidkante 21 , die mit Gegenschneidkanten 22 zusammenwirken, die an den inneren Enden der Schaufeln 4 angeordnet sind. Beim Drehen des Laufrades 3 fahren die Gegenschneidkanten 22 des Laufrades über die Schneidkanten 21 der Schneidblätter, so dass zwischen diesen Schneidkanten geratene Festteile des Schmutzwassers abgeschert und zerkleinert werden. Each fixed cutting blade 18 of the cutting insert forms a cutting edge 21 on a curved edge facing the impeller blades 4 which cooperate with counter cutting edges 22 located at the inner ends of the blades 4. When rotating the impeller 3, the counter cutting edges 22 of the impeller drive over the cutting edges 21 of the cutting blades, so that sheared between these cutting edges solid parts of the dirty water sheared and crushed.
Somit liegen die Außenflächen des Ringbereichs 15 und der Schneidblätter 18 in einem zur Pumpenachse koaxialen Zylindermantel, dessen Radius gleich, oder minimal kleiner ist als der Radius der zylindrischen Innenflächen des Rings 10 und der Wandteile 5 des Laufrades 3, so dass das Laufrad von der zylindrischen Thus, the outer surfaces of the annular portion 15 and the cutting blades 18 are in a coaxial to the pump axis cylinder jacket whose radius is equal to, or minimally smaller than the radius of the cylindrical inner surfaces of the ring 10 and the wall parts 5 of the impeller 3, so that the impeller of the cylindrical
Außenfläche des Schneideinsatzes 13 geführt ist. Outside surface of the cutting insert 13 is guided.

Claims

Ansprüche Expectations
1. Kreiselpumpe insbesondere Abwasser- oder Schmutzwasser-Motorpumpe mit einem insbesondere topfförmigen Laufrad (3), dessen der 1. Centrifugal pump, in particular wastewater or dirty water motor pump with a particularly cup-shaped impeller (3), the
Pumpensaugöffnung (16) zugewandte Stirnseite eine Öffnung bildet und die der Saugöffnung abgewandte Laufrad-Stirnseite durch eine Tragscheibe (8) bedeckt ist, an der die gekrümmten Schaufeln (4) befestigt insbesondere angeformt sind, dadurch gekennzeichnet, dass in den The end face facing the pump suction opening (16) forms an opening and the impeller end face facing away from the suction opening is covered by a support disk (8) to which the curved blades (4) are attached, in particular integrally formed, characterized in that in the
Innenraum des Laufrades (3) ein insbesondere unrotierbarer, fest stehender Schneideinsatz (13) koaxial zur Laufradachse hineinragt, der mindestens eine Schneidkante (21) aufweist, die mit mindestens einer Gegenschneidkante (22) des Laufrades (3) eine Schneidvorrichtung bildet. Inside the impeller (3) a particularly non-rotatable, fixed cutting insert (13) projects coaxially to the impeller axis, which has at least one cutting edge (21) which forms a cutting device with at least one counter-cutting edge (22) of the impeller (3).
2. Kreiselpumpe nach Anspruch 1, dadurch gekennzeichnet, dass der Schneideinsatz (13) die dem Motor abgewandte Öffnung (10) des 2. Centrifugal pump according to claim 1, characterized in that the cutting insert (13) has the opening (10) of the motor facing away from the motor
Laufrades (3) mit einem zylindrischen Bereich (15) ausfüllt, der die Impeller (3) fills with a cylindrical area (15) which
Saugöffnung (16) der Pumpe bildet. Suction opening (16) of the pump forms.
3. Kreiselpumpe nach Anspruch 2, dadurch gekennzeichnet, dass das Laufrad (3) mit einem zylindrischen Ringbereich (10) außen den 3. Centrifugal pump according to claim 2, characterized in that the impeller (3) has a cylindrical ring region (10) on the outside
zylindrischen Bereich (15) des Schneideinsatzes (13) als Lager umgibt. cylindrical area (15) of the cutting insert (13) surrounds as a bearing.
4. Kreiselpumpe nach einem der vorherigen Ansprüche, dadurch 4. Centrifugal pump according to one of the preceding claims, characterized
gekennzeichnet, dass der Schneideinsatz (13) aus der Öffnung (10) des Laufrades (3) herausragt und mit seinem herausragenden Bereich (15) an dem Pumpengehäuse (1) drehfest befestigt ist. characterized in that the cutting insert (13) protrudes from the opening (10) of the impeller (3) and is attached to the pump housing (1) in a rotationally fixed manner with its protruding area (15).
5. Kreiselpumpe nach einem der vorherigen Ansprüche, d a d u r c h gekennzeichnet, dass die Tragscheibe (8) ein Drehlager für den Schneideinsatz (13) bildet. 5. Centrifugal pump according to one of the preceding claims, characterized in that the support disk (8) forms a rotary bearing for the cutting insert (13).
6. Kreiselpumpe nach einem der vorherigen Ansprüche, dadurch 6. Centrifugal pump according to one of the preceding claims, characterized
gekennzeichnet, dass der Schneideinsatz (13) zwei bis vier insbesondere drei im Laufradinneren angeordnete gebogene Schneidblätter ( 8) mit jeweils einer Schneidkante (21) aufweist. characterized in that the cutting insert (13) has two to four, in particular three, curved cutting blades (8) arranged inside the impeller, each with a cutting edge (21).
7. Kreiselpumpe nach einem der vorherigen Ansprüche dadurch 7. Centrifugal pump according to one of the preceding claims
gekennzeichnet, dass das Laufrad (3) ein bis drei insbesondere zwei Gegenschneidkanten (22) aufweist. characterized in that the impeller (3) has one to three, in particular two, counter-cutting edges (22).
8. Kreiselpumpe nach einem der vorherigen Ansprüche, dadurch 8. Centrifugal pump according to one of the preceding claims, characterized
gekennzeichnet, dass die Gegenschneidkanten (22) des Laufrades characterized in that the counter-cutting edges (22) of the impeller
(3) von den inneren Endkanten der Laufradschaufeln (4) gebildet sind. (3) are formed by the inner end edges of the impeller blades (4).
9. Kreiselpumpe nach einem der vorherigen Ansprüche, dadurch 9. Centrifugal pump according to one of the preceding claims, characterized
gekennzeichnet, dass die Schaufeln (4) des Laufrades (3) zum Laufradinneren hin derart gekrümmt sind, dass die Erzeugenden der characterized in that the blades (4) of the impeller (3) are curved towards the inside of the impeller in such a way that the generators of the
Laufradinnenfläche von einer Vielzahl von Geraden gebildet sind, die parallel zur Drehachse des Laufrades (3) liegen. The inner surface of the impeller is formed by a large number of straight lines which lie parallel to the axis of rotation of the impeller (3).
10. Kreiselpumpe nach einem der vorherigen Ansprüche, dadurch 10. Centrifugal pump according to one of the preceding claims, characterized
gekennzeichnet, dass die innere Schneidkante (22) jeder Schaufel characterized in that the inner cutting edge (22) of each blade
(4) als inneres Ende der Schaufel parallel zur Laufraddrehachse liegt. (4) as the inner end of the blade is parallel to the impeller rotation axis.
1 . Kreiselpumpe nach einem der vorherigen Ansprüche, dadurch 1 . Centrifugal pump according to one of the preceding claims, characterized
gekennzeichnet, dass die Saugöffnung (16) des Schneideinsatzes (13) sich zum Pumpeneinlass hin konusförmig erweitert. characterized in that the suction opening (16) of the cutting insert (13) widens conically towards the pump inlet.
12. Kreiselpumpe nach einem der vorherigen Ansprüche, dadurch 12. Centrifugal pump according to one of the preceding claims, characterized
gekennzeichnet, dass im Bereich der Schaufeln (4) das Laufrad (3) teilzylindrische Wandteile (5) aufweist, innerhalb derer der Schneideinsatz (13) mit teilzylindrischen Außenflächen (25) liegt, wobei der Innenradius (D) des Laufrad-Wandteils (5) gleich oder nur gering größer ist als der Außenradius der Schneidblatt-Außenflächen. characterized in that in the area of the blades (4), the impeller (3) has partially cylindrical wall parts (5), within which the cutting insert (13) with partially cylindrical outer surfaces (25), the inner radius (D) of the impeller wall part (5) being equal to or only slightly larger than the outer radius of the cutting blade outer surfaces.
EP15713648.2A 2014-03-27 2015-03-25 Centrifugal pump comprising a cutting device Active EP3090185B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL15713648T PL3090185T3 (en) 2014-03-27 2015-03-25 Centrifugal pump comprising a cutting device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014004420.3A DE102014004420A1 (en) 2014-03-27 2014-03-27 Centrifugal pump with cutting device
PCT/EP2015/000634 WO2015144307A1 (en) 2014-03-27 2015-03-25 Centrifugal pump comprising a cutting device

Publications (2)

Publication Number Publication Date
EP3090185A1 true EP3090185A1 (en) 2016-11-09
EP3090185B1 EP3090185B1 (en) 2021-02-24

Family

ID=52785033

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15713648.2A Active EP3090185B1 (en) 2014-03-27 2015-03-25 Centrifugal pump comprising a cutting device

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Country Link
EP (1) EP3090185B1 (en)
DE (1) DE102014004420A1 (en)
PL (1) PL3090185T3 (en)
WO (1) WO2015144307A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108071595B (en) * 2017-12-12 2020-08-21 解树超 All-medium passing type sewage pump

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1026933B (en) * 1955-05-13 1958-03-27 Maurice Gerardin Device for comminuting solids located in a liquid
US3096718A (en) * 1961-12-12 1963-07-09 Conard Kenner Trash cutter for a pump
CH411584A (en) * 1964-07-10 1966-04-15 Kolb Eugen Ag Centrifugal pump for pumping contaminated liquids
DE2634683A1 (en) 1976-08-02 1978-02-09 Hermann Dipl Ing Wank Slurry pump for agriculture and sewage - has disc rotor with blades comminuting any solids without blockage
DE3017182A1 (en) * 1980-05-05 1981-11-12 Központi Bányászati Fejlesztési Intézet, Budapest Slurry delivery equipment - with refinement during delivery
FI824113A0 (en) 1982-11-30 1982-11-30 Ahlstroem Oy FOERFARANDE OCH ANORDNING FOER FIBRERING AV FOERBEHANDLAT AVFALLSPAPPER
US4778336A (en) * 1987-07-09 1988-10-18 Weil Pump Company Cutter pump subassembly
SE466766B (en) * 1989-04-27 1992-03-30 Flygt Ab Itt Centrifugal pump intended for pumping of liquids containing solid particles, for example, rags and other long-stretched objects
US8109714B2 (en) * 2007-09-06 2012-02-07 Keener Robert M Sewage pump
DE102008057233A1 (en) 2008-11-10 2010-05-12 Orpu Pumpenfabrik Gmbh Milling device for use in pump to e.g. mill thick matter available in sewage water, has cutting devices formed spatially separate from another cutting device such that rotation symmetric cutting parts enclose stationary cutting part

Also Published As

Publication number Publication date
WO2015144307A1 (en) 2015-10-01
DE102014004420A1 (en) 2015-10-01
EP3090185B1 (en) 2021-02-24
PL3090185T3 (en) 2021-07-12

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